Air-heating furnace with selective



c. s. s'ro'uT AIR HEATING FURNACE WITH SELECTIVELY CONTROLLED RADIATOR STRUCTURE Filed Nov. 18, 1944 2 Sheets-Sheet 1 IN V EN TOR. 62 4005 Li 5700f April 6, 1948.. c. s. STOUT AIR HEATING FURNACE WITH SELECTIVELY CONTROLLED RADIATOR STRUCTURE 2 Sheets-Shet 2 Filed NOV. 18, 1944 INVENTOR.

Array/ma- Patented Apr. 6, 1948 AIR-HEATING FURNACE WITH SELECTIVE? LY CONTROLLED RADIATOR STRUCTURE Claude S. Stout, Marsh Marshall Furnace 00., poration of Michigan all, Mich., assignor to Marshall, Mich., a cor Application November 18, 1944, Serial No. 564,093

This invention relates to improvements, in air heating faumace with selectively controlled radiator structure.

The main objects of this invention are:

First, to provide a furnace which may be readily adapted for the burning of gas or oil or solid fuel and which is highly efficient for either adaptation.

Second, to provide a furnace structure in which there is a free flow of air through the hot air casing and around the combustion unit.

Third, to provide a hot air furnace in which a large percentage of the heat units are utilized.

Fourth, to provide in a furnace a radiator structure which is readily adapted for the particular installations and. the types of fuel and.

one which may be easily cleaned.

Objects relating to details and economies of theinvention will appear from the description to follow. The invention is defined in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which:

i Fig. 1 is a side elevation partially in vertical.

section of a furnace embodying the features of my invention, certain parts being shown mainly in conventional form, the baffles of the main conduit partition walls being omitted.

Fig. .2 is a horizontal fragmentary view partially in horizontal section on line 2-2 of Fig. 1.

Fig. 31s a fragmentary view partially in vertical section of an embodiment of my invention adapted to a liquid fuel burning furnace.

Fig. 4 is a fragmentary view partially in section on line 4-4 of Fig. 3.

Fig. is a perspective view of the radiator partition or baflie member removed from the radiator.

Fig. 6 is a fragmentary view illustrating an adaptation of my invention as a gas burning furnace. i

In general, the furnace body I is the same for burning solid fuel,rliquid fuel or gas. In burning solid fuel, a grate shown conventionally at 2 is provided. In burning liquidfuel, a firepot 3 is provided with a nozzle 4 for injecting the liquid. In Fig. 6, I illustrate a gas burner 5 which issub stituted for the grate 2. The adaptations to the burning of different fuels is of importance in that the remaining portions of the structure are such as to be readily adapted to the different fuels and to-different installations.

The combustion chamber or furnace body I is provided with a lateral discharge 6 connected to the top of the combustion chamber. The hot air casing l is provided with a top 8 having a 8 Claims, (01.126-99) A 2 flange 9 to which a suitable conduit pipe header or delivery pipe may be connected.

My improved radiator lunit comprises a radiator designated generally by the numeral Ill which is arranged in a casing II. The hot air casing and the radiator casing have a wall I! in common in the embodiment illustrated. The discharge 6 of the combustion unit extends through this wall and is providedwith a flange 13 to which the flange I4 on the radiator is bolted.

The radiator comprises a. longitudinal conduit i5 of uniform diameter from end to end and straight, this conduit however having a plurality of U-shaped branchesorauxlliary conduits, l6. opening to the sides thereof preferably in opposed; pairsas shown in Fig. 2.. The outer end of the. main conduit l5 projects through the outer wall ll of the radiator casing to receive the coupling member I8 of the smoke flue 19. A damper 28:

is provided at the outer end of the member It.

A blower 2| is arranged in the bottom of the casing H and. delivers into the bottom of the; hot air casing 1. An inlet 22 is provided at the top of the radiator casing so that the air is drawn into the radiator casing and across the radiator and discharged into the bottom of the hot air casingaronnd the combustion unit or furnace body. Filters shown conventionally at '23 are preferably provided so that all the air circulated by the blower is filtered. 7

To adapt the radiator to difl'erent types of fuel andto different installations, I provide a baffle member; 24 consisting of the horizontal bar 25 having bafiles or partition walls 26 fixedly secured thereto. This bafile member maybe removably arranged within the. longitudinal conduit of the radiator member to position the bafile or partition walls 26 between the arms of the U-shaped radiator branches or auxiliary conduits as shown in Fig. 4 so that the products of combustion must circulate through these auxiliary conduits as is indicated by the arrows in Fig. 4. This arrangement is best calculated to utilize the heat units but for some fuels and installations a direct passage for the products of combustion through the mainconduitis required and in such cases the baffle member is removed. It can be removed. or inserted in the event the furnace is changed from one fuel to another or to adapt it to particular conditions. of flue draft. The radiator maybe quite readily cleaned as the branches are such that a cleaning tool may be readily passed through the same and the collected soot scraped or pulledout of the main conduit.

I have not attempted to illustrate or describe;

comprising a hot air casing having. one wall in common with the casing of said combustion a radiator arranged in said radiator casing and comprising a main conduit connected at one-end to the outlet of said combustion unit, theother end being adapted for connection to a smoke flue, said main conduit'being straight and: oi uniform cross sectional diameter and having a plurality c of horizontally disposed U-shaped auxiliary" con duits or branches having. both the inlet and discharge openings thereof connected: to the of the main conduit between inlet and outlet openings thereof, said auxiliary eonduitsbeing connected to thesides oithe main conduit in. op posed pairs, and a bafiie member memorably mounted in said main conduit and comprising a longitudinal bar having a plurality of disk-like conduit baffl'es secured thereto, said baffles being so spaced along the bar that a bafite is disposed in the main conduitlc'retw'een said inlet and dis charge openings of each auxiiiary'comi it if-each pair: of auxiliary conduits-tor closing the main: conduit between said inretand dischargeopenings of each auxiliary conduit and thereby cause the products of combustion to now through-said auxiliary conduits passing through theradiator.

2. The combinationiwitn' a: combustion unit provided with a hot aircasing, of a radiator: unit comprising a hot aircasing having one Wall in common with the casing I or said; combustion unit, a radiator arranged in said radiator casing and comprising a main conduit connected atone end to the outlet of said combustion unit, the other end being adapted for connection to a smoke; flue,

said main conduit being straight and of uniform cross sectional diameter and having a" plurality of horizontally disposed U-sha-ped auxiliary conduits or branches having both the inlet discharge openings thereof connected to the sides oi radiator unit comprising a straight rna'i'n con duit connected at one-end to the discharge of said combustion unit and adapted for connection at the other end to a smoke-flue, said main conduit having a plurality of l'ioriz'ontaliy disposed opposed pairs of U-shaped auxiliary conduits hav ing both the inlet and discharge mteningsv there: of connected to the sidesor the main conduitbetween the inlet and" discharge openings there of', and a baffle unit removably mounted the main conduit and comprisinga'supporting' bar adapted to rest on the bottom of the" main conduit and having a plurality of bafiles mounted thereon and supported thereby, said baflles being so spaced along the bar that a baffle is disposed in the main conduit between said inlet and discharge openings of each auxiliary conduit of each pair of auxiliary conduits to direct the products of combustion therethrough when the bafile unit isin position, there being a direct passage through I said main conduit when the bafile unit is removed.

4a The combination with a combustion unit provided a discharge for the products of combustion, of a radiator unit comprising a straight rriaincenduit connected at one end to the discharge of said combustion unit and adapted for connection at the other end to a smoke flue", said main conduit having a plurality of U- shaped auxiliary conduits having both the inlet and discharge openings thereof connected to the sides of the main conduit between the inlet and discharge openings-'th'ereohanda pained-nit remova-biy' mounted in'the'main conduit and compris ing a supporting bar adapted to rest on the bot tom of the main conduit and having a; plurality of baiiles mounted tl'lereon and supported thereby, said b-aflie's' being so spaced along the bar that a bafile is disposed in the main conduit between said inlet and discharge openings of each aux iliary conduit to direct the products of combustion thereth-ro'ugh when the b'afiie unit is in po sition, there being a direct passagethrough' said main: conduit when the baiile unit is removed.-

5. The combination with a combustionunit provided. with 2,1 discharge for the of combustion, of a radiatonunit comprising a straight main conduit connectedat one efidto the discharge of said. combustion unit and adapted' for connection. at the other end to aismoke flue, said mainconduit having a plurality ot'horizontal'ly disposed opposed pairs of U-shap 'gg' ..c

iliar conduits having both the inlet'and' discharge openings thereof connected to the sides of the main conduit between the inlet andd-is charge openings thereof, and baffles remov'ubly arranged inthe main conduit, said-baffles being so spaced in'the main conduit that a basis is disosed between said: inlet and discharge-openings of each auxiliary conduit of each pairoffauxii' iaty conduits to direct the products of combuse tion therethroughn 6E The combination with a combustion unit provided With a discharge for the products off combustion, of a radiator unit coin-prising" a straight main conduit connected at onejend' to a the discharge of said combustion unit and adaptedfor connection at the other end'to 'a smoke flue, said main conduit having a pIural-ity of fu sh'aped auxiliary conduits having both-the inlet and discharge openings thereof connected to the sides of the main conduit between the inlet and discharge openings-thereof, and"baiiles) so disposed that a-bafile is located in the'mai'rr conduit between saidinlet and discharge openings of each auxiliary conduit to direct products of com bustion therethrough, said baii'ies being adjustable relative to said last" named inlet; and-dis charge openings to permit passageof products of combustion through that portion of the main conduit disposed between the inlet anddi'scharge openings of each auxiliary conduit.

7. The combination With'a combustion unit, and a radiator comprising a in'ain con-duit connecte'd at one end to the-outlet of said combustion unit, the-other end' being adapted for icon ne'ction to a smoke flue, said main conduit being straight and of uniform cross sectional diameter and having a plurality of horizontally disposed U-shaped conduits or branches having both the inlet and discharge openings thereof connected to the sides of the main conduit between the inlet and outlet openings thereof, said auxiliary conduits being connected to the sides of the main conduit in opposed pairs, and a bafile member removably mounted in said main conduit and comprising a longitudinal bar having a plurality of disk-like conduit baflles secured thereto and adapted to be positioned and supported by said longitudinal bar, said baffles being so spaced ,along the longitudinal bar that a baffle is disposed in the main conduit between said inlet and discharge openings of each auxiliary conduit of each pair of auxiliary conduits to direct the prod ucts of combustion therethrough.

8. The combination with a combustion unit, and a radiator comprising a main conduit connected at one end to the outlet of said combustion unit, the other end being adapted for connection to a smoke flue, said main conduit being straight and of uniform cross sectional diameter and having a plurality of horizontally disposed U-shaped auxiliary conduits or branches having both the inlet and discharge openings thereof connected to the sides of the main conduit be- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 1,575 Paddock Nov. 24, 1863 46,601 Wilson Feb, 28, 1865 85,564 Coles Jan. 5, 1869 152,274 Camp June 23, 1874 986,538 Schimkei Jan. 1, 1935 1,369,069 Westness Feb. 22, 1921 1,482,112 Booker Jan. 29, 1924 1,991,449 Cornelius Feb, 19, 1935 

